Calibre is a free and open-source e-book management software that allows users to manage their e-books, convert between different e-book formats, and sync e-books with various devices. It was first released in 2006 and has since become one of the most popular e-book management tools available.

One of the most notable features of Calibre is its ability to organize e-books into different categories and add tags, making it easy to search and locate specific books. It also allows users to edit the metadata of their e-books, including the title, author, and cover image, and can even download missing metadata from online sources.

Calibre also provides a powerful e-book conversion tool, allowing users to convert e-books from one format to another, such as from EPUB to MOBI, or from PDF to EPUB. This is particularly useful for those who want to read e-books on different devices that may not support the same file format.

In addition, Calibre supports a wide range of e-book readers, including Amazon Kindle, Barnes & Noble Nook, and Kobo e-readers, and can automatically sync e-books with these devices. It can also connect to online e-book stores, such as Amazon and Google Books, allowing users to browse and purchase e-books directly from within the software.

Calibre is an essential tool for anyone who reads and manages e-books. Its powerful features and easy-to-use interface make it a must-have for anyone looking to organize, convert, and sync their e-book library.

Key Features:

• Library management system to organize e-book collection
• Format conversion for compatibility with different devices
• Built-in editor to modify e-book metadata and table of contents
• E-book viewer with customization options
• Integrated web browser for downloading e-books
• Synchronization options for keeping e-book collection up-to-date across devices
• Extensible with plugins to add additional features and functionality.

Version 1.28.0

New Features

• Edit Book: Add a tool to easily insert hyperlinks (click the insert hyperlink button on the toolbar)
• Edit book: Add a tool to easily open a file inside the book for editing by just typing a few characters from the file name. To use it press Ctrl+T in the editor or go to Edit->Quick open a file to edit'
• Edit book: Allow disabling the completion popups for the search and replace fields. Right click on the search/replace field to enable/disable the completion popup
• E-book viewer: Add an option to control the maximum text height in full screen. Note that it only works if the viewer is in paged mode (which is the default mode).
• Show the search expression for the virtual library in a tooltip when hovering over the tab for the virtual library.
• Book details panel: Show author URL in a tooltip when hovering over author names
• Kobo driver: Update to handle updated Kobo firmware

Bug Fixes

• Library backup: Avoid infinite retries if converting metadata to backup OPF for a book fails. Simply fail to backup the metadata for that book.
• Edit book: Fix file permissions for the edited book being changed on Linux and OS X
• Fix text entry cursor becoming invisible when completion popup is opened
• Possible fix for crash on OS X Mavericks when adding duplicates
• E-book viewer: Fix pressing the Esc key to leave full screen mode not changing the state of the full screen button
• When reading metadata from filenames, do not apply the fallback regexp to read metadata if the user specified regexp puts the entire filename into the title. The fallback is only used if the user specified expression does not match the filename at all.
• Linux binary install script: Fix error on linux systems where the system python has an encoding of None set on stdout. Assume encoding is utf-8 in this case.
• Content server: Fix (maybe) an error on some windows computers with a non-standard default encoding